Portable battery case



FIG. 1 is a front perspective view of a portable battery case showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and

FIG. 8 is a rear perspective view thereof with an attached strap and belt shown in broken lines.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable battery case, as shown and described. 